重点研究了在搅拌铸造过程中低碳钢搅拌桨在铝合金 熔体中的冲蚀磨损随时间和转速的变化规律和机理.结果表明：搅拌桨的冲蚀磨损速度随搅拌时间和搅拌速度的增加而增加，但随搅拌时间的增加有一孕育期，低于孕育期，冲蚀磨损速度很小.该孕育期随搅拌速度的增加而减小，并且在转速超过1000 r/min以上，加速减小.搅拌桨在铝合金熔体的冲蚀磨损过程是一个表面净化，铝原子扩散，化合物的形成和剥离过程，冲蚀磨损速度主要与氧化物的生成速度和氧化物的剥离速度有关.旋转速度的变化主要影响化合物的剥离速度.
The erosion behavior of a mixing impeller blade made of low carbon steel in molten aluminum alloy as function of time and rotational speed has been studied during process of stircast for Al alloys,and the relevant erosion mechanism is also discussed. The result shows that the erosion induced weight loss rate increases with the prolonging mixing time and the raising rotational speed.There is an incubation period of time,below which,erosion rate is very small.This incubation period decreases with the increase of rotational speed,and which decreases sharply when the rotational speeds exceed 1000 r/min.The erosion process in mixing aluminum alloy may involve processes such as blade surface cleaning, diffusion of aluminum atom onto and the intermetallic compound formation on and the compound removal from the blade surface.The rotational speed affects primarily the removal of the formed compound.
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